[Tests] use nyc for coverage

Author: ljharb

.gitignore

@@ -5,3 +5,6 @@ node_modules
 npm-shrinkwrap.json
 package-lock.json
 yarn.lock
+
+.nyc_output/
+coverage/

.nycrc

@@ -0,0 +1,13 @@
+{
+	"all": true,
+	"check-coverage": false,
+	"reporter": ["text-summary", "text", "html", "json"],
+	"lines": 86,
+	"statements": 85.93,
+	"functions": 82.43,
+	"branches": 76.06,
+	"exclude": [
+		"coverage",
+		"dist"
+	]
+}

package.json

@@ -10,7 +10,7 @@
 		"pretest": "npm run lint",
 		"test": "npm run tests-only",
 		"posttest": "aud --production",
-		"tests-only": "covert test",
+		"tests-only": "nyc tape 'test/**/*.js'",
 		"lint": "eslint --ext=js,mjs ."
 	},
 	"contributors": [
@@ -31,8 +31,8 @@
 	"devDependencies": {
 		"@ljharb/eslint-config": "^20.1.0",
 		"aud": "^1.1.5",
-		"covert": "^1.1.1",
 		"eslint": "^8.6.0",
+		"nyc": "^10.3.2",
 		"safe-publish-latest": "^2.0.0",
 		"tape": "^4.14.0"
 	},